Can I use the G5X-2 cam with 60 thousandths milled off my heads?

I know you are all going to say it probably wont clear, but I want to know what can I do to make it work? Is there a thicker gasket that will bring me in the (safe) PTV clearance range?

For the guys that have used this cam, how much do you have shaved off your heads?

What's the Maximum amount that has been shaved off that you have got away with?

Also, Has anyone used nitrous with this cam? If so, how did it work? I haven't seen anyone talk about nitrous, just HP numbers.

I just want to ask a few questions before I waste my money on something that wont fit. <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />

Thank you for your imput in advance.

 

60 is way to much. When I talked to Lou he said even 30 thou was to much.

 

Regarding the "thick head gasket" route, you'll probably want to stay away from anything that will result in a quench height of more than .035-.040; if you go taller than that, the detonation tolerance goes down in a hurry.

BTW- this is not just for G5X2 cam-equipped cars; nor is it just for LSx motors. It is a pretty common rule of thumb on nearly all motors with quench-type heads.

 

<img border="0" alt="[cry]" title="" src="graemlins/gr_cry.gif" /> Dang, I was afraid of that. I guess my option is to sell my heads to someone and buy another set. This really sucks. <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />

 

You can also cut your pistons... but you'd have to talk to Lou about how much you'd need to notch out (I think it's Isky that makes the tool that is commonly used).

Regarding the thickness of the face of the piston, it is my understanding that they actually have pretty thick faces... I guess that what I am saying is that if you'll call Lou, tell him what you've got, and ask him what you'll need to do to make the cam work, he'll be able to give you better information than I can. Ya dig?? <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

dont worry I wont quote you. LOL Yeah, I'll call them and ask them about it. But every time I call there I have to talk to someone that works there insted of Lou him self. If they dont work, I guess there is always Ebay. <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />

Then I have to figure out what other heads to buy after that? Thanks for all the imput guys!! <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" /> Dont drink & drive.

 

If you end up cutting valve reliefs, make sure you use the milled heads to align the cuts else the geometry will be off.

 

If I remember right 2cc vavle reliefs will work fine in the pistons. DO NOT QUOTE ME ON THAT THOUGH

 

I bought the SDPC ls6 heads that are CNCd and milled .055 and I have been researching this SAME question for a while now.

Since the heads are designed for the ASA racing circuit, the ASA GM Cam should work great; it is a full out cam that may not pass emmisions, however. Some report here that it idles and is not too mean for the street, however.

Since the CNC work on my heads was done at Lingfelter, I asked them what cam they would recommend for the street. They said this:


We would use our GT2-3. 207/220 duration at .050" .573/.580 lift 117.5.
This camshaft sells for 429.95.

Please let me know if you are interested.

Thank you,

Tim Dyer
Sales Manager
Lingenfelter Performance Engineering, Inc.
260 724 2552 x 312
http://www.lingenfelter.com
ICQ# 223991829
******************************************

On the thick gasket issue, I also researched this. The forced induction guys use thick gaskets but they have drawbacks. Cometic makes gaskets up to .114 - $200 a pair. Everyone said this is way too thick. They said about .80 is the max you dare to go - also $200.


I also researched the flycut piston thing too. Apparently, the best way to do this is to rent a head with seats machined out and a special cutting tool for intake and exhaust would be used. You cut the reliefs by bring the piston to TDC - bolt on the cutting head litely and cut with a ratchet or drill until the head meets the deck... repeat for each valve relief...

Since the thick gasket and the flycut alternatives are a PITA, I would suggest going with a cam that is designed for heavily milled heads...


I will likely try the ASA cam... not sure about pushrod lenght?????

Question: How are you going to deal with the plastic manifold alignment pin issue; as you know, the pins do not align with heavily milled heads...????